package demo;
public class TestCircle {
    public static void main(String[] args) {
        Circle circle=new Circle();
        circle.setR(10);
        System.out.println("圆的半径是："+circle.getR());
        System.out.println("圆的面积是;"+circle.getArea());
        System.out.println("圆的周长是："+circle.getPerimeter());


    }
}
